Hastings triplets achromatic lenses are designed to provide an infinite conjugate ratio and are useful for focusing collimated beams and for magnification. Steinheil triplets achromatic lenses are designed to provide a finite conjugate ratio and 1:1 imaging.

Plaon-convex cylindrical lenses are used to provide focusing power in one section only, For illumination or detection of light from line sources.Also used for anamorphic compression of beams and images. 1. Used to Focus Light in One Dimension 2. Provide Anamorphic Shaping of a Beam 3. Rectangular and Circular Form Factors Available